EP0553446A2 - Method and device for detecting impurities, especially foreign fibres in elongated textile articles - Google Patents

Method and device for detecting impurities, especially foreign fibres in elongated textile articles Download PDF

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EP0553446A2
EP0553446A2 EP92120818A EP92120818A EP0553446A2 EP 0553446 A2 EP0553446 A2 EP 0553446A2 EP 92120818 A EP92120818 A EP 92120818A EP 92120818 A EP92120818 A EP 92120818A EP 0553446 A2 EP0553446 A2 EP 0553446A2
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Prior art keywords
light
textile structure
signal
signals
diameter
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German (de)
French (fr)
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EP0553446B1 (en
EP0553446B2 (en
EP0553446A3 (en
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Georg Schürch
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Loepfe AG Gebrueder
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Loepfe AG Gebrueder
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/36—Textiles
    • G01N33/365—Textiles filiform textiles, e.g. yarns
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
    • G01N21/8915—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined non-woven textile material

Definitions

  • the invention relates to a method and a device for the detection of impurities, in particular foreign fibers in elongated, textile structures.
  • the fibers are first mechanically cleaned by carding. Coarse dirt can be removed from the fibers. On the other hand, there are certain contaminants, such as Foreign fibers of various types that cannot be removed in this way. These are spun into the thread or yarn and impair the subsequent processing processes and the quality of the end product.
  • yarn cleaners are known, with which yarn irregularities such as thick or thin spots and the like can be recognized and eliminated by cutting out the relevant piece of yarn.
  • optical sensors which use reflection, transmission and projection work, but usually provide signals that are also dependent on the yarn diameter. Therefore, in the above-mentioned devices, an attempt is made to arrange so that the light picked up and evaluated by the optical sensor is as independent as possible of the respective yarn diameter, so that, if possible, only signal changes due to foreign fibers are evaluated. Such arrangements are usually complex and require a very precise adjustment to the thread to be processed. This makes it difficult to achieve sufficient signal independence from the thread thickness.
  • Two measurements can be combined in such a way that the diameter portion of one measurement is compensated for by the diameter dependence of the second measurement.
  • a conventional yarn cleaning sensor can be coupled with a foreign fiber sensor.
  • the yarn cleaning sensor delivers a signal proportional to the diameter.
  • the signal of the foreign fiber sensor is calculated with this signal, so that it is almost no longer dependent on the diameter. This compensation is preferably carried out by a microprocessor.
  • the first exemplary embodiment which is explained with reference to FIG. 1, has two measuring points, which are accommodated in a common sensor head 1, through which the thread or the yarn 2 is guided.
  • a sensor S 1 is arranged, by means of which pulsed light from a light source D 1 is received.
  • the change in the amount of light received and / or the change in its spectral distribution, superimposed by a diameter-dependent portion, indicate the presence of impurities.
  • European Patent No. 197 763 or Swiss Patent No. 674 379 Although the necessary adjustments can largely be dispensed with. It is advantageous to use lighting by means of light-emitting diodes whose wavelength is short-wave, i.e. is in the range of green and blue of visible light or in the ultraviolet range. This allows the contrast and thus the signal-to-noise ratio to be increased.
  • the recorded, pulsating sensor signal is converted via a high-pass filter HP and an amplifier AMP, which are arranged in the sensor head 1, and via a rectifier GR and a low-pass filter TP into a direct current signal, the level of which is converted into digital signals in a microprocessor 3 is converted.
  • the corresponding measured values are referred to as external fiber measurement signals FFMW. Impurities appear in it as signal changes, which are, however, superimposed on signal changes which are due to changes in the thickness of the thread.
  • a measuring signal MW proportional to the diameter is recorded.
  • the measuring principle used for this purpose of projecting the thread 2 illuminated by a light source D2 onto a light-sensitive sensor S2 is known per se from yarn cleaners and therefore need not be explained in detail.
  • this pulsating sensor signal is also converted into an amplified direct current signal, the level of which is further processed in the microprocessor 3 in the form of digital signals. This signal is essentially only dependent on the diameter of the thread.
  • the diameter-compensated external fiber measurement signal can then be further processed in the microprocessor 3 with the aim of determining the presence from the measured value curve derive from impurities and operate a thread cleaner accordingly.
  • the microprocessor 3 is also responsible for the clocked activation of the light-emitting diodes. For this purpose, it supplies a control circuit 4 with a clock frequency and an actuating signal for regulating the brightness.
  • the two measuring points can advantageously be arranged one behind the other in a single sensor head 1. Instead, they can also be combined, as will be explained with reference to FIG. 2.
  • a common sensor S3 occurs, which alternately reflects light from the thread 2 from the light-emitting diode D1 or the projection of the thread 2 by means of the light-emitting diode D2.
  • the corresponding switchover takes place synchronously with the alternating, clocked operation of the two light-emitting diodes D 1 and D 2 by a changeover switch U which is controlled by the microprocessor 3.
  • the control circuit 4 which is also clocked by the microprocessor, ensures the alternating operation of the LEDs D1 and D2.
  • the linking of the signals which have been recorded separately and stored in this way takes place in the manner already described, while eliminating the diameter-dependent signal component.
  • a pure diameter determination of the thread 2 takes place at one of the measuring points, while at the other measuring point a more or less diameter-dependent detection of impurities by recording the reflected light he follows. If contamination is not just on the front, but are recorded over the entire circumference of the thread, this can be done by absorption in a measuring field flooded with diffuse light, in which the light picked up by the sensor and reflected back by the thread overall into the measuring field is measurably reduced (see, for example, EP no 197 763).

Abstract

In order to detect impurities, especially foreign fibres, in threads light which is reflected on the thread is picked up using a sensor (S1) and produces a first measurement signal (FFMW) whose magnitude is dependent on the occurrence of an impurity and on the diameter of the thread. In order to eliminate the diameter-dependent component of the signal, a second measurement signal (MW) is picked up which is essentially dependent only on the diameter of the thread. By linking the two signals in a computer (3), the influence of the thread diameter on the first measurement signal is essentially compensated for. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Detektion von Verunreingiungen, insbesondere Fremdfasern in langgestreckten, textilen Gebilden.The invention relates to a method and a device for the detection of impurities, in particular foreign fibers in elongated, textile structures.

Vor der Herstellung von Fäden und Garnen aus Baumwolle oder anderen Naturfasern findet zunächst eine mechanische Reinigung der Fasern durch Kardieren statt. Damit können grobe Verunreinigungen aus den Fasern entfernt werden. Anderseits gibt es gewisse Verunreinigungen, wie z.B. Fremdfasern verschiedener Art, die sich auf diese Weise nicht entfernen lassen. Diese werden in den Faden oder das Garn eingesponnen und beeinträchtigen die nachfolgenden Bearbeitungsprozesse sowie die Qualität des Endproduktes.Before the production of threads and yarns from cotton or other natural fibers, the fibers are first mechanically cleaned by carding. Coarse dirt can be removed from the fibers. On the other hand, there are certain contaminants, such as Foreign fibers of various types that cannot be removed in this way. These are spun into the thread or yarn and impair the subsequent processing processes and the quality of the end product.

Bekannt sind sogenannte Garnreiniger, mit denen Garnunregelmässigkeiten wie Dick- oder Dünnstellen und dergleichen erkannt und durch Herausschneiden des betreffenden Garnstückes beseitigt werden können.So-called yarn cleaners are known, with which yarn irregularities such as thick or thin spots and the like can be recognized and eliminated by cutting out the relevant piece of yarn.

Ferner sind auch Geräte entwickelt worden, mittels denen auf optischem Weg Verunreinigungen in Garnen, z.B. sogenannte Fremdfasern, festgestellt und ebenfalls beseitigt werden können. Solche Geräte, wie sie z.B. im Europäischen Patent Nr. 197 763 oder in der Schweizer Patentschrift Nr. 674 379 beschrieben sind, beruhen im wesentlichen auf der Analyse des von einem Faden reflektierten Lichtes.Furthermore, devices have also been developed by means of which contamination in yarns, e.g. so-called foreign fibers, can be determined and also eliminated. Such devices as e.g. in European Patent No. 197 763 or in Swiss Patent No. 674 379 are essentially based on the analysis of the light reflected by a thread.

Geräte, welche nach dem optischen Prinzip arbeiten, können dabei die Fremdfasern mit Hilfe der unterschiedlichen, optischen Materialkonstanten erkennen. Die optischen Sensoren, welche mit Reflexion, Transmission und Projektion arbeiten, liefern jedoch in der Regel Signale, die auch vom Garndurchmesser abhängig sind. Deshalb wird bei den oben genannten Geräten versucht, die Anordnung so zu treffen, dass das vom optischen Sensor aufgenommene und ausgewertete Licht möglichst unabhängig vom jeweiligen Garndurchmesser ist, so dass möglichst nur Signaländerungen infolge von Fremdfasern ausgewertet werden. Solche Anordnungen sind in der Regel aufwendig und verlangen eine sehr exakte Abstimmung auf den jeweils zu bearbeitenden Faden. Damit ist es schwierig, eine ausreichende Signalunabhängigkeit von der Fadendicke zu erzielen.Devices that work on the optical principle can recognize the foreign fibers with the help of the different optical material constants. The optical sensors, which use reflection, transmission and projection work, but usually provide signals that are also dependent on the yarn diameter. Therefore, in the above-mentioned devices, an attempt is made to arrange so that the light picked up and evaluated by the optical sensor is as independent as possible of the respective yarn diameter, so that, if possible, only signal changes due to foreign fibers are evaluated. Such arrangements are usually complex and require a very precise adjustment to the thread to be processed. This makes it difficult to achieve sufficient signal independence from the thread thickness.

Es stellt sich auf diesem Hintergrund die Aufgabe, ein Verfahren und eine Vorrichtung zum Erkennen von Verunreinigungen, insbesondere von Fremdfasern in Fäden oder Garnen zu schaffen, womit auf einfache Weise ein Messergebnis gewonnen werden kann, das im wesentlichen nur für das Auftreten von Verunreinigungen charakteristisch ist und nicht vom Durchmesser des geprüften Fadens oder Garns abhängt.Against this background, it is the task of creating a method and a device for the detection of impurities, in particular foreign fibers in threads or yarns, with which a measurement result can be obtained in a simple manner which is essentially only characteristic of the occurrence of impurities and does not depend on the diameter of the thread or yarn tested.

Diese Aufgabe wird durch die in den Ansprüchen 1 und 7 genannten Merkmale gelöst.This object is achieved by the features mentioned in claims 1 and 7.

Es können dabei zwei Messungen so kombiniert werden, dass der Durchmesser-Anteil der einen Messung durch die Durchmesserabhängigkeit der zweiten Messung wegkompensiert wird.Two measurements can be combined in such a way that the diameter portion of one measurement is compensated for by the diameter dependence of the second measurement.

Ein üblicher Garnreinigungs-Sensor kann dafür mit einem Fremdfaser-Sensor gekoppelt werden. Der Garnreinigungs-Sensor liefert ein durchmesserproportionales Signal. Mit diesem Signal wird das Signal des Fremdfaser-Sensors verrechnet, so dass dieses beinahe nicht mehr durchmesserabhängig ist. Vorzugsweise wird diese Kompensation von einem Mikroprozessor ausgeführt.A conventional yarn cleaning sensor can be coupled with a foreign fiber sensor. The yarn cleaning sensor delivers a signal proportional to the diameter. The signal of the foreign fiber sensor is calculated with this signal, so that it is almost no longer dependent on the diameter. This compensation is preferably carried out by a microprocessor.

Nachfolgend werden weitere Merkmale und Vorteile der Erfindung anhand von Ausführungsbeispielen erläutert. In den Zeichnungen zeigen hierzu:

  • Figur 1 eine schematische Darstellung einer ersten Ausführung der Erfindung; und
  • Figur 2 eine entsprechende Darstellung einer zweiten Ausführung der Erfindung.
Further features and advantages of the invention are explained below on the basis of exemplary embodiments. The drawings show:
  • Figure 1 is a schematic representation of a first embodiment of the invention; and
  • Figure 2 shows a corresponding representation of a second embodiment of the invention.

Das erste Ausführungsbeispiel, das anhand der Figur 1 erläutert wird, besitzt zwei Mess-Stellen, welche in einem gemeinsamen Sensorkopf 1 untergebracht sind, durch welchen der Faden oder das Garn 2 geführt wird. An der ersten Mess-Stelle ist ein Sensor S₁ angeordnet, mittels welchem gepulstes Licht aus einer Lichtquelle D₁ empfangen wird. Die Veränderung der empfangenen Lichtmenge und/oder die Veränderung von deren spektraler Verteilung zeigen dabei, überlagert von einem durchmesserabhängigen Anteil, das Vorliegen von Verunreinigungen an. Für den Detail-Aufbau entsprechender Mess-Stellen kann auf das Europäische Patent Nr. 197 763 oder das Schweizer Patent Nr. 674 379 verwiesen werden, wobei die dort notwendigen Abstimmungen weitgehend entfallen können. Mit Vorteil wird dabei eine Beleuchtung mittels lichtemittierenden Dioden eingesetzt, deren Wellenlänge kurzwellig, d.h. im Bereich von Grün und Blau des sichtbaren Lichtes oder im ultravioletten Bereich ist. Damit lässt sich der Kontrast und somit der Störabstand verstärken.The first exemplary embodiment, which is explained with reference to FIG. 1, has two measuring points, which are accommodated in a common sensor head 1, through which the thread or the yarn 2 is guided. At the first measuring point, a sensor S 1 is arranged, by means of which pulsed light from a light source D 1 is received. The change in the amount of light received and / or the change in its spectral distribution, superimposed by a diameter-dependent portion, indicate the presence of impurities. For the detailed structure of corresponding measuring points, reference can be made to European Patent No. 197 763 or Swiss Patent No. 674 379, although the necessary adjustments can largely be dispensed with. It is advantageous to use lighting by means of light-emitting diodes whose wavelength is short-wave, i.e. is in the range of green and blue of visible light or in the ultraviolet range. This allows the contrast and thus the signal-to-noise ratio to be increased.

Das aufgenommene, pulsierende Sensor-Signal wird über einen Hochpassfilter HP und einen Verstärker AMP, die im Sensorkopf 1 angeordnet sind, sowie über einen Gleichrichter GR und einen Tiefpassfilter TP in ein Gleichstrom-Signal verwandelt, dessen Pegel in einem Mikroprozessor 3 in Digital-Signale umgewandelt wird. Die entsprechenden Messwerte werden hier als Fremdfasermess-Signale FFMW bezeichnet. Verunreinigungen erscheinen darin als Signaländerungen, die allerdings überlagert sind von Signaländerungen, welche auf Dickenänderungen des Fadens zurückgehen.The recorded, pulsating sensor signal is converted via a high-pass filter HP and an amplifier AMP, which are arranged in the sensor head 1, and via a rectifier GR and a low-pass filter TP into a direct current signal, the level of which is converted into digital signals in a microprocessor 3 is converted. The corresponding measured values are referred to as external fiber measurement signals FFMW. Impurities appear in it as signal changes, which are, however, superimposed on signal changes which are due to changes in the thickness of the thread.

An einer zweiten Mess-Stelle im Messkopf 1 wird ein durchmesserproportionales Mess-Signal MW aufgenommen. Das dazu verwendete Messprinzip der Projektion des mittels einer Lichtquelle D₂ beleuchteten Fadens 2 auf einen lichtempfindlichen Sensor S₂ ist aus Garnreinigern an sich bekannt und braucht deshalb nicht im Detail erläutert zu werden. Auch dieses pulsierende Sensor-Signal wird, wie oben erläutert, in ein verstärktes Gleichstrom-Signal gewandelt, dessen Pegel im Mikroprozessor 3 in Form von Digital-Signalen weiterverarbeitet wird. Dieses Signal ist im wesentlichen nur vom Durchmesser des Fadens abhängig.At a second measuring point in the measuring head 1, a measuring signal MW proportional to the diameter is recorded. The measuring principle used for this purpose of projecting the thread 2 illuminated by a light source D₂ onto a light-sensitive sensor S₂ is known per se from yarn cleaners and therefore need not be explained in detail. As explained above, this pulsating sensor signal is also converted into an amplified direct current signal, the level of which is further processed in the microprocessor 3 in the form of digital signals. This signal is essentially only dependent on the diameter of the thread.

Im Mikroprozessor 3 werden alsdann die jeweils zusammengehörenden Messwerte der beiden Mess-Stellen miteinander verknüpft. Bewegt sich der Faden mit einer bekannten Geschwindigkeit v und ist der Abstand zwischen den Mess-Stellen d, so bedeutet dies, dass die Messwerte der ersten Mess-Stelle mit einer Verzögerung von δ = d/v mit den Messwerten der zweiten Mess-Stelle zu verknüpfen sind.In the microprocessor 3, the respectively related measurement values of the two measurement points are then linked to one another. If the thread moves at a known speed v and the distance between the measuring points is d, this means that the measured values of the first measuring point increase with a delay of δ = d / v with the measured values of the second measuring point are linked.

Die Verknüpfung kann nach der Formel:

Figure imgb0001

   wobei:

FFMWKOMP
das durchmesserkompensierte Fremdfasermess-Signal
FFMW
das Fremdfasermess-Signal, wie es vom Sensor S₁ geliefert wird,
MW
das Mess-Signal des Reinigungssensors S₂, und
K
ein Koeffizient ist.
The link can be according to the formula:
Figure imgb0001

in which:
FFMW COMP
the diameter-compensated external fiber measurement signal
FFMW
the foreign fiber measurement signal, as it is supplied by the sensor S₁,
MW
the measurement signal of the cleaning sensor S₂, and
K
is a coefficient.

Es sind allenfalls auch andere mathematische Zusammenhänge möglich, wie z.B. geeignete Addition oder Subtraktion der Signale.At most, other mathematical relationships are possible, such as appropriate addition or subtraction of the signals.

Das durchmesserkompensierte Fremdfasermess-Signal kann hernach im Mikroprozessor 3 weiterverarbeitet werden mit dem Ziel, aus dem Messwertverlauf das Vorhandensein von Verunreinigungen abzuleiten und einen Fadenreiniger entsprechend zu betätigen.The diameter-compensated external fiber measurement signal can then be further processed in the microprocessor 3 with the aim of determining the presence from the measured value curve derive from impurities and operate a thread cleaner accordingly.

Der Mikroprozessor 3 ist neben der Auswertung des Messergebnisses auch für die getaktete Ansteuerung der lichtemittiernden Dioden verantwortlich. Hierzu liefert er einer Ansteuerschaltung 4 eine Taktfrequenz sowie ein Stellsignal zur Regelung der Helligkeit.In addition to evaluating the measurement result, the microprocessor 3 is also responsible for the clocked activation of the light-emitting diodes. For this purpose, it supplies a control circuit 4 with a clock frequency and an actuating signal for regulating the brightness.

Wie bereits erwähnt, können die beiden Mess-Stellen mit Vorteil in einem einzigen Sensorkopf 1 hintereinander angeordnet werden. Statt dessen können sie auch zusammengefasst werden, wie dies anhand der Figur 2 erläutert wird. Anstelle der zwei Sensoren S₁ und S₂ tritt ein gemeinsamer Sensor S₃, der abwechselnd vom Faden 2 reflektiertes Licht aus der Leuchtdiode D₁ bzw. die Projektion des Fadens 2 mittels der Leuchtdiode D₂ aufnimmt. Die entsprechende Umschaltung erfolgt synchron zum alternierenden, getakteten Betrieb der beiden Leuchtdioden D₁ und D₂ durch einen Umschalter U, der vom Mikroprozessor 3 angesteuert wird. Die Ansteuerschaltung 4, welche ebenfalls vom Mikroprozessor getaktet ist, sorgt für den alternierenden Betrieb des Leuchtdioden D₁ und D₂. Die Verknüpfung der so aufgenommenen, separat zwischengespeicherten Signale erfolgt in der bereits beschriebenen Art unter Eliminierung des durchmesserabhängigen Signalanteils.As already mentioned, the two measuring points can advantageously be arranged one behind the other in a single sensor head 1. Instead, they can also be combined, as will be explained with reference to FIG. 2. Instead of the two sensors S₁ and S₂, a common sensor S₃ occurs, which alternately reflects light from the thread 2 from the light-emitting diode D₁ or the projection of the thread 2 by means of the light-emitting diode D₂. The corresponding switchover takes place synchronously with the alternating, clocked operation of the two light-emitting diodes D 1 and D 2 by a changeover switch U which is controlled by the microprocessor 3. The control circuit 4, which is also clocked by the microprocessor, ensures the alternating operation of the LEDs D₁ and D₂. The linking of the signals which have been recorded separately and stored in this way takes place in the manner already described, while eliminating the diameter-dependent signal component.

Es versteht sich, dass sowohl bei diesem als auch beim vorangehenden Ausführungsbeispiel statt jeweils einer Leuchtdiode D₁ bzw. D₂, Gruppen von entsprechenden Leuchtdioden vorgesehen sein können, wie z.B. im Europäischen Patent Nr. 197 763 beschrieben.It goes without saying that both in this and in the preceding exemplary embodiment, instead of one light-emitting diode D 1 or D 2, groups of corresponding light-emitting diodes can be provided, e.g. in European Patent No. 197 763.

Erfolgt die Messung an zwei Mess-Stellen, wie im ersten Ausführungsbeispiel, so findet an einer der Mess-Stellen eine reine Durchmesserbestimmung des Fadens 2 statt, während an der anderen Mess-Stelle durch Aufnahme des reflektierten Lichtes eine mehr oder weniger durchmesserabhängige Erkennung von Verunreinigungen erfolgt. Sollen Verunreinigungen nicht nur auf der Vorderseite, sondern über den gesamten Umfang des Fadens erfasst werden, so kann dies durch Absorbtion in einem von diffusem Licht durchfluteten Messfeld geschehen, in welchem das durch den Sensor aufgenommenen, vom Faden insgesamt ins Messfeld zurück reflektierte Licht messbar reduziert wird (vergl. z.B. EP-Nr. 197 763).If the measurement is carried out at two measuring points, as in the first exemplary embodiment, a pure diameter determination of the thread 2 takes place at one of the measuring points, while at the other measuring point a more or less diameter-dependent detection of impurities by recording the reflected light he follows. If contamination is not just on the front, but are recorded over the entire circumference of the thread, this can be done by absorption in a measuring field flooded with diffuse light, in which the light picked up by the sensor and reflected back by the thread overall into the measuring field is measurably reduced (see, for example, EP no 197 763).

Die erläuterte Verknüpfung beider Mess-Signale erlaubt es, auf einfache Weise die Durchmesserabhängigkeit des Fremdfasermess-Signals zu reduzieren, ohne dass hierfür ein besonderer, zusätzlicher Aufwand notwendig ist.The explained combination of the two measurement signals allows the diameter dependency of the external fiber measurement signal to be reduced in a simple manner without any special, additional outlay being necessary for this.

Claims (11)

Verfahren zur Detektion von Verunreinigungen, insbesondere von Fremdfasern, in langgestreckten, textilen Gebilden, dadurch gekennzeichnet, dass ein erstes Signal aufgenommen wird, dessen Grösse vom Auftreten einer Verunreinigung im textilen Gebilde abhängig ist und vom Durchmesser des textilen Gebildes beeinflusst wird, und dass ein zweites Signal aufgenommen wird, welches im wesentlichen nur vom Durchmesser des textilen Gebildes abhängig ist, wobei das erste Signal und das zweite Signal so verknüpft werden, dass die Durchmesser-Abhängigkeit des ersten Signals im wesentlichen eliminiert wird.Method for the detection of impurities, in particular foreign fibers, in elongated textile structures, characterized in that a first signal is recorded, the size of which depends on the occurrence of contamination in the textile structure and is influenced by the diameter of the textile structure, and in that a second Signal is recorded, which is essentially only dependent on the diameter of the textile structure, wherein the first signal and the second signal are linked so that the diameter dependence of the first signal is substantially eliminated. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das erste Signal im wesentlichen durch die Aufnahme von Licht erzeugt wird, das vom beleuchteten textilen Gebilde reflektiert wird, und dass das zweite Signal im wesentlichen durch die Projektion des beleuchteten textilen Gebildes auf einen lichtempfindlichen Sensor erzeugt wird.A method according to claim 1, characterized in that the first signal is generated essentially by the absorption of light which is reflected by the illuminated textile structure, and that the second signal is generated essentially by the projection of the illuminated textile structure onto a light-sensitive sensor . Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die beiden jeweils miteinander verknüpften Signale im wesentlichen von derselben Stelle des textilen Gebildes aufgenommen werden.Method according to one of the preceding claims, characterized in that the two signals which are in each case linked to one another are recorded essentially from the same point on the textile structure. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die beiden Signale an verschiedenen, voneinander beabstandeten Mess-Stellen aufgenommen werden, durch welche das textile Gebilde hindurch bewegt wird, wobei die Signale der in Bewegungsrichtung vorderen Mess-Stelle zeitlich so verzögert werden, dass sie zusammen mit den örtlich entsprechenden Signalen der anderen Mess-Stelle verknüpft werden.Method according to one of the preceding claims, characterized in that the two signals are recorded at different, spaced apart measuring points through which the textile structure is moved, the signals of the measuring point at the front in the direction of movement being delayed in time such that they are linked together with the locally corresponding signals from the other measuring point. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Verknüpfung der beiden Signale durch Bildung des Quotienten des ersten mit dem zweiten Signal gebildet wird.Method according to one of the preceding claims, characterized in that the combination of the two signals is formed by forming the quotient of the first and the second signal. Verfahren nach einem der vorangehenden Ansprüche 2 bis 5, dadurch gekennzeichnet, dass für die Beleuchtung des textilen Gebildes gepulstes Licht mit einer Wellenlänge kleiner oder gleich grün verwendet wird.Method according to one of the preceding claims 2 to 5, characterized in that pulsed light with a wavelength less than or equal to green is used for illuminating the textile structure. Vorrichtung zur Durchführung des Verfahrens nach einem der vorangehenden Ansprüche, gekennzeichnet durch mindestens einen lichtempfindlichen Sensor (S) sowie durch mindestens zwei Lichtquellen (D₁, D₂), wobei mindestens eine der Lichtquellen (D₁) das textile Gebilde so beleuchtet, dass der lichtempfindliche Sensor (S) davon reflektiertes Licht empfängt, und wobei mindestens eine der Lichtquellen (D₂) das textile Gebilde so beleuchtet, dass es auf den Sensor (S) projiziert wird, wobei die entsprechenden Sensor-Signale in einem Rechner (3) miteinander verknüpft werden.Device for carrying out the method according to one of the preceding claims, characterized by at least one light-sensitive sensor (S) and by at least two light sources (D₁, D₂), at least one of the light sources (D₁) illuminating the textile structure in such a way that the light-sensitive sensor ( S) receives reflected light, and at least one of the light sources (D₂) illuminates the textile structure so that it is projected onto the sensor (S), the corresponding sensor signals being linked together in a computer (3). Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass zwei Mess-Stellen (S₁, D₁; S₂, D₂) vorgesehen sind, wobei an der ersten ein lichtempfindlicher Sensor (S₁) zum Empfang von reflektiertem Licht des textilen Gebildes angeordnet ist, und wobei an der zweiten ein lichtempfindlicher Sensor (S₂) vorgesehen ist, auf welchen das textile Gebilde projiziert wird.Apparatus according to claim 7, characterized in that two measuring points (S₁, D₁; S₂, D₂) are provided, wherein a photosensitive sensor (S₁) for receiving reflected light of the textile structure is arranged on the first, and wherein on the second, a light-sensitive sensor (S₂) is provided, on which the textile structure is projected. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass an der zweiten Mess-Stelle ein Garnreiniger-Sensor (S₂) angeordnet ist, dessen Signale ein Mass für den Durchmesser des textilen Gebildes sind und die gleichzeitig zur Ueberwachung von Dick- bzw. Dünnstellen auswertbar sind.Apparatus according to claim 8, characterized in that a yarn cleaner sensor (S₂) is arranged at the second measuring point, the signals of which are a measure of the diameter of the textile structure and which can be evaluated at the same time for monitoring thick or thin places. Vorrichtung nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass der oder die Sensoren (5) mit einem Rechner (3) verbunden sind, in welchem die Sensor-Signale zur Kompensation der Abhängigkeit vom Durchmesser des textilen Gebildes mathematisch verknüpft werden.Device according to one of claims 7 to 9, characterized in that the one or more sensors (5) are connected to a computer (3) in which the sensor signals to compensate for the dependence on the The diameter of the textile structure can be mathematically linked. Vorrichtung nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, dass mindestens die Lichtquellen (D₁), deren Licht durch Reflexion vom lichtempfindlichen Sensor (5) aufgenommen werden, Leuchtdioden mit einer Wellenlänge kleiner oder gleich grün sind.Device according to one of claims 7 to 10, characterized in that at least the light sources (D₁), the light of which is received by reflection from the light-sensitive sensor (5), are light-emitting diodes with a wavelength less than or equal to green.
EP92120818A 1992-01-31 1992-12-05 Method for detecting impurities, especially foreign fibres in elongated textile articles Expired - Lifetime EP0553446B2 (en)

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CH284/92 1992-01-31
CH284/92A CH683035A5 (en) 1992-01-31 1992-01-31 Method and apparatus for detection of impurities, in particular foreign fibers, in elongate textile structures.

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EP0553446A2 true EP0553446A2 (en) 1993-08-04
EP0553446A3 EP0553446A3 (en) 1994-03-09
EP0553446B1 EP0553446B1 (en) 1999-03-24
EP0553446B2 EP0553446B2 (en) 2008-08-20

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Also Published As

Publication number Publication date
EP0553446B1 (en) 1999-03-24
CH683035A5 (en) 1993-12-31
JPH05273152A (en) 1993-10-22
DE59209666D1 (en) 1999-04-29
EP0553446B2 (en) 2008-08-20
EP0553446A3 (en) 1994-03-09
US5383017A (en) 1995-01-17
JP3238506B2 (en) 2001-12-17

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